Can someone tell me what this is?

Today I was installing a second hdd in my unibody macbook pro 17", and while inserting the new hdd tray I managed to tear off a connection that was soldered to the logic board. To top it off one of the micro pins that was on the connector fell off and I lost it forever.

Now I'd like to know what exactly is this wire that connects to the board (isight?) and if the macbook can function properly without it. Thanks for checking.